Feed machanism for screw-machines.



A W LUBENOW.

FEED MECHANISM FOR SCREW MACHINES. APPLICATION FILED NOV. 30. 1911.

1,%$8,@?2 Patented Dec. 17, 1918.

err-ire ARTHUR W. LUBENO'W, F MILWAUKEE, WISCONSIN.

FEED MACHANISM FOR SCREW-MACHINES.

Specification of Letters Patent.

Patented Dec. 17, leis.

Application filed November 30, 1917. Serial No. 204.607.

To all whom it may concern Be it known that I, ARTHUR W. LUBENOW, a citizen of the United States, residing at Milwaukee, county of Milwaukee, and State o of Wisconsin, have invented new and useful Improvements in Feed Mechanism for Screw-lilachines, of which the following is a specification.

My invention relates to improvements in screw machines, and it pertains more especially, among other things, to the construction of the tubular clamping sleeve by which a rod or other material is moved forward a short distance at a time corresponding to the length of screw to be formed, perparatory to being rigidly clamped by the clamping jaws of the lathe used for such purpose. l-leretofore the tubular clamping sleeve has been formed in e. single piece, and the two opposing sides have been connected together one end by a continuous piece Oi metal, whereby the opposite ends of said sleeve caused to spring toward each other and nst the rod or other material that is med into screws, whereby the necessary friction is produced for moving such rod other material "forward from time to time c118 latter is med into screws. my my improvement my clamping sleeve rmed in a plurality of separate pieces, such separate pieces are held together moved inwardly toward each other and the rod or er material to be med into screws by a plurality of separate clamping sp lngs or resilient rings, two or more or such springs being preferably ns-d whereby the two separate members of clamping sleeve ar forced toward each i r and against the rod or other material which is formed into screws with uniform pressure throughout the entire length of such clai o; sleeve, andthe liability of such clamping sleeve becoming broken is red to minimum.

- will be understood that the rod or her material to be formed into SOIQWS is the jaws of the ordinary lathe, whereby such rod or other material 18 revolved no he ordinary y as is losing actec upon d forward by my device it is clamped Fig, 4 is a modified form of my devicein' perspective, with the exterior sleeve removed, and

Fig. 5 is a modified form of my improved clamping device.

Like parts are identified by the same ref erence numerals throughout the several views. My clamping sleeve comprises the two separate members 1, 1, which members are held in contact and caused to bear upon the exterior walls of the rod 2 by the annular springs 3, 3, whereby said rod 2 is moved forwardly by the friction of such parts, when it is rigidly clamped by the jaws 4, 4. of the lathe in the ordinary manner. In the form shown in Figs. 1, 2 and 3 l have shown. my clampin sleeve inclosed in an additional sleeve 5, but such sleeve 5 may in some instances be dispensed with, as shown in 5, invention herein being predicated more especially upon forming the clampng sleeve in a plurality er separate parts 1, and holding them in place my a plurality mmuler clamping spring 3, 3, as shown, one 1 make no claim herein to the other parts a lathe shown in l.

6 is a feed sleeve. the form shown in Figs. 1, 2 and 3 the sleeve 5 is connected with the feed sleeve by the screw thread 7'. ll' hen, however, the sleeve 5 is dispensed with the tubular clam sleeve formed the parts i, 1 is ted with the feed sleeve 6 by the threaded collar 9 and the collar 10. The collar 333. however, is not tireaded but simply serves to support the clamping sleeve formed oi the members 1, l In the form shown in it 2 the clamping sleeve formed of the members t its "front end against the shoulder ii, and its rear end against the collar 12, whereby ipted to b ie. as stated invention, c to secure t n separate iii embers, in coinoination with l plurality of clamping springs, and a longer tubular sleeve adapted to surround and inclose said clamping springs.

2. in a device of the described class, a clamping sleeve comprising two separate semi-tubular members, in combination with a plurality of clamping springs, said clamping springs being adapted to surround said semi-tubular members and hold the latter in Contact, and to move them toward each other and against the rod or other material which is formed into screws, adapted to firmly grip the rod or other material to be formed into screws and cause the latter to revolve with said lather nesacva 3. in a device of the described class, a clampingsleeve comprising a plurality of separate semi-tubular members, in combination with a plurality of clamping springs,

said clamping springs being adapted to sur- 

